KR101576888B1 - System and method by transforming infrared to visible light using optical fiber - Google Patents

Abstract

Disclosed are an arc detection system of infrared-visible ray conversion using an optical fiber and a method thereof. The arc detection system according to the present invention comprises: an infrared ray optical lens which outputs an infrared ray generated by arc in a distribution board by selectively transmitting the infrared ray; a phosphor glass which converts the infrared ray outputted from the infrared optical lens into the visible ray and then outputs the converted visible ray; an optical fiber for delivering the visible ray outputted from the phosphor glass; a light-receiving lens which receives and transmits the visible ray delivered through the optical fiber; a photo diode which amplifies the visible ray transmitted by the light-receiving lens and then outputs the amplified visible ray; and an arc generation judgment module which judges arc generation using the visible ray outputted from the photo diode. According to the arc detection system of infrared-visible ray conversion using the optical fiber and the method thereof, the arc detection system has the effect of being able to remove disturbing lights like the infrared ray, and the visible ray caused by phosphor or sunlight and to detect arc generation in the distribution board accurately, by being configured to judge arc detection by selectively filtering the infrared ray mainly generated by arc and converting the filtered infrared ray into the visible ray. Especially, the arc detection system has the effect of being able to detect arc generation in the distribution board accurately, by removing infrared ray noise also by considering the infrared ray by the natural light.

Description

TECHNICAL FIELD [0001] The present invention relates to an arc detection system and method using an infrared-visible light conversion system using an optical fiber,

INDUSTRIAL APPLICABILITY The present invention can be applied to a high-voltage, low-voltage, More particularly, the present invention relates to an arc detection system and method using an infrared-visible light conversion system using an optical fiber, and more particularly, to an arc detection system and method using an infrared-visible light conversion system. .

Arc arc accidents in the switchboard are one of the major causes of damage to large-scale fire and power outages.

The arc accident is one of the most serious accidents in the switchboards. If the duration is long, the panel and power devices are damaged and cause a long period of power outage. In addition, when the accident happens, . In case of such an arc accident, various measures are taken for the safety of the operator and the durability of the power distribution system, but these regulations are not kept well and often cause great damage.

There are many safety precautions to be taken in the switchgear because there is a great deal of damage from breakdowns and power outages. Inside the switchboard, arc accidents are often caused by operator error, dielectric breakdown due to aging, and the invasion of animals and insects.

In the United States, more than 2,000 arc flash accidents are reported every year, and more than 25% of electric accidents are caused by arc flash accidents in Korea.

Various methods have been proposed to prevent the damage caused by the arc or to accurately detect the arc. However, there is still a very insufficient measure to protect the internal arc of the switchboard.

Protection from short-circuiting of existing protection relays takes several tens of milliseconds to judge whether or not an accident has occurred. However, when an arc accident occurs in a power distribution panel, the maximum value is reached within a short time, The second-order damage such as the damage is very large.

In addition, in the conventional switchgear, a method of detecting an indirect electrical signal for detecting an arc is mainly used. However, there is a problem that frequent erroneous detection is caused by an external noise such as an influence of an electric signal other than a short circuit.

In addition, since the conventional arc detection system relies on the detection by the total current signal by the current transformer irrespective of the arc generation position, there is a problem that the arc generation position can not be accurately detected.

In addition, since the detected current waveform is non-linearly outputted in accordance with the load type such as R, L, C, etc., there is a problem that accurate detection is also limited when an arc occurs.

As described above, it is important to quickly detect an arc and take measures quickly before a problem occurs due to the characteristics of the arc, and there is a limit to accurately detecting the arc.

Korean Patent Publication No. 2013-0137370 (Dec. 17, 2013)

It is an object of the present invention to provide an infrared-visible light conversion arc detection system using optical fibers.

Another object of the present invention is to provide an infrared-visible light conversion method using an optical fiber.

In the infrared-visible light conversion arc detection system using optical fibers according to the present invention, An infrared optical lens for selectively transmitting and outputting infrared rays generated by an arc; A fluorescent glass for converting infrared rays output from the infrared optical lens into visible light and outputting the visible light; An optical fiber for transmitting visible light output from the fluorescent glass; A light receiving lens for receiving and transmitting a visible light transmitted through the optical fiber; A photodiode for amplifying and outputting visible light transmitted through the light receiving lens; And an arc generation determining module that determines whether or not an arc is generated by using a visible ray output from the photodiode.

Here, the display device may further include an infrared LED for amplifying visible light emitted from the fluorescent glass to emit visible light.

Here, the arc generation determination module may include an arc signal shaping circuit for converting a visible light transmitted through the optical fiber into a logical signal; An arc signal counter for counting the number of arc occurrences using the logic signal converted by the arc signal shaping circuit; A data latch for generating an alarm driving signal in accordance with the counted number of arcs generated in the arc signal counter; An alarm generating circuit for generating an alarm by an alarm driving signal generated in the data latch; A pulse width conversion circuit for converting a pulse width to calculate an arc duration time using the logic signal converted by the arc signal shaping circuit; An arc start circuit for generating an arc start signal by the pulse width converted by the pulse width conversion circuit; A digital signal processing circuit for determining whether the arc is continued by performing frequency analysis and statistical analysis of the arc start signal generated in the arc start circuit and stopping the alarm of the alarm generating circuit when it is determined that the arc is stopped; And a display for indicating whether the arc determined in the digital processing signal circuit is continuous and where an arc is recognized through the optical fiber.

It is preferable that the infrared optical lens is configured so that an anti-reflective coating process is performed so that infrared rays of a wavelength of 800 nm to 860 nm are selectively transmitted and light of other wavelengths is not transmitted.

The refractive index (nd) of the infrared optical lens is preferably larger than 1.49 and smaller than 1.78, and Abbe number (vd) is preferably larger than 46.0 and smaller than 91.0.

The infrared optical lens preferably has a maximum incident angle of 55 degrees, an F number (F number) of 2.0, a refractive index of 1.713, and a dispersion of 53.94.

Preferably, the optical fiber is composed of an optical fiber bundle composed of a single optical fiber for each arc detection sensor so that the position of the arc detection sensor in which an arc is detected can be confirmed.

Preferably, the optical fiber is configured to apply an infrared ray-responsive phosphor to an end surface of the optical fiber.

The arc generation determination module may be configured to determine that an arc occurs when the power density of the arc exceeds 5 uW / cm < 2 >.

According to another aspect of the present invention, there is provided an arc-detecting method of an infrared-visible light conversion using optical fibers, comprising: selectively transmitting infrared rays generated by an arc of an infrared optical lens and outputting the infrared rays; Converting the infrared light output from the infrared optical lens into visible light by the fluorescent glass and transmitting the visible light through the optical fiber; The infrared LED amplifies visible light emitted from the infrared ray-reactive phosphor and emits the light; Receiving and transmitting a visible light transmitted through the optical fiber by a light receiving lens; Amplifying and outputting visible light transmitted through the light receiving lens by a photodiode; And generating an alarm by determining whether or not an arc is generated using the visible ray output from the photodiode.

The arc generation determining module may determine whether an arc is generated using the visible light output from the photodiode, wherein the arc signal shaping circuit converts a visible light transmitted through the optical fiber into a logical signal Converting; Counting the number of arc occurrences using an arc signal counter using the logic signal converted in the arc signal shaping circuit; Generating an alarm driving signal in accordance with a count of arcs generated by the data latch in the arc signal counter; An alarm generating circuit generating an alarm by an alarm driving signal generated in the data latch; The pulse width conversion circuit converting the pulse width to calculate the arc duration using the logic signal converted in the arc signal shaping circuit; The arc start circuit generating an arc start signal by the pulse width converted in the pulse width conversion circuit; The digital signal processing circuit performs frequency analysis and statistical analysis of the arc start signal generated in the arc start circuit to determine whether or not the arc continues, and stopping the alarm of the alarm generating circuit when it is determined that the arc is stopped; The display may be configured to indicate whether the arc determined in the digital processing signal circuit is continuing and where the occurrence of the arc is recognized through the optical fiber.

At this time, it is preferable that the infrared optical lens is configured so that an anti-reflective coating process is performed so that infrared rays having a wavelength of 800 nm to 860 nm are selectively transmitted and light having other wavelengths is not transmitted.

The refractive index (nd) of the infrared optical lens is preferably larger than 1.49 and smaller than 1.78, and Abbe number (vd) is preferably larger than 46.0 and smaller than 91.0.

The infrared optical lens preferably has a maximum incident angle of 55 degrees, an F number (F number) of 2.0, a refractive index of 1.713, and a dispersion of 53.94.

Preferably, the optical fiber is composed of an optical fiber bundle composed of a single optical fiber for each arc detection sensor so that the position of the arc detection sensor in which an arc is detected can be confirmed.

Preferably, the optical fiber is configured to apply an infrared ray-responsive phosphor to an end surface of the optical fiber.

The arc generation determination module determines whether an arc is generated using the visible light output from the photodiode and generates an alarm if the power density of the arc exceeds 5 uW / cm < .

According to the infrared-visible light conversion system and method using the optical fiber described above, the infrared rays, which are mainly generated by the arc, are selectively filtered and converted into visible rays to determine the arc detection, It is possible to remove the disturbance light such as visible light and ultraviolet light by the light and to detect the arc accurately.

In particular, there is an effect that the generation of an arc can be accurately detected by removing infrared rays in consideration of infrared rays caused by natural light.

In addition, since visible light is transmitted through an optical fiber to an arc detection circuit, and each arc detection sensor transmits through a separate single optical fiber, it is possible to accurately recognize and quickly cope with an arc generated position.

1 is a spectral spectral distribution diagram of light generated by an arc when an arc is generated.
FIG. 2A is a configuration diagram of an infrared-visible light conversion arc detection system using optical fibers according to an embodiment of the present invention.
FIG. 2B is a configuration diagram of a switchboard to which an infrared-visible light conversion arc detection system using optical fibers according to an embodiment of the present invention is applied.
3 is a block diagram of an arc generation determination module according to an embodiment of the present invention.
4 is a graph illustrating an output error of the infrared-visible light conversion type according to an embodiment of the present invention.
5 is a structural view of an infrared optical lens according to an embodiment of the present invention.
6 is a graph showing a refractive index / dispersion distribution diagram of an infrared optical lens according to an embodiment of the present invention.
7 is a table showing the internal transmittance of a 5 mm thick infrared optical lens according to an embodiment of the present invention.
8 is a graph showing MTF characteristics according to spatial frequencies of an infrared optical lens according to an embodiment of the present invention.
9 is a graph showing spectral characteristics of an infrared ray transmission filter according to an embodiment of the present invention.
10 is a graph showing a spectral distribution of an infrared optical lens according to an embodiment of the present invention.
11 is a perspective view of an optical fiber according to an embodiment of the present invention.
12 is a transmission / reception sequence of a MODBUS-RTU protocol according to an embodiment of the present invention.
13 is a flowchart of a method of detecting an arc by a light conversion method according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail to the concrete inventive concept.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a spectral spectral distribution diagram of light generated by an arc when an arc is generated.

Referring to FIG. 1, there is shown a spectrum distribution of light generated by an arc when an arc occurs in a switchboard. As shown in FIG. 1, arc-induced light has the strongest intensity at 800 nm to 860 nm. The wavelength band from 800 nm to 860 nm is an infrared wavelength band, and it can be seen that infrared rays are most strongly displayed by the arc.

Accordingly, if the infrared ray is strongly sensed, it can be determined that an arc is generated. The present invention is configured to detect the occurrence of an arc when infrared rays are strongly sensed.

In the interior of the switchboard, noise light such as light of an internal fluorescent lamp as well as a visible light incident from the outside are considerably present. Thus, it is configured to remove noise light such as visible light or ultraviolet light.

In addition, there is infrared ray existing in natural light or fluorescent light. In the present invention, it is configured to judge whether there is an infrared ray due to arc generation in consideration of the basic infrared ray.

Basically existing infrared rays can be configured to take into consideration by setting the minimum optical density of infrared rays.

FIG. 2A is a configuration diagram of an infrared-visible light conversion system using an optical fiber according to an exemplary embodiment of the present invention, FIG. 2B is a diagram illustrating an infrared-visible light conversion using an optical fiber according to an exemplary embodiment of the present invention. Type arc detection system is applied.

Referring to FIGS. 2A and 2B, an arc detection system (hereinafter, referred to as an 'arc detection system') 100 using an optical fiber using an infrared-visible light conversion system according to an embodiment of the present invention includes an infrared optical lens A fluorescent glass 120, an optical fiber 130, an infrared LED (light emitting diode) 140, a light receiving lens 150, a photodiode 160, and an arc occurrence determination module 170 . ≪ / RTI >

Hereinafter, the detailed configuration will be described.

The infrared optical lens 110 may be configured to selectively transmit and receive infrared rays generated by an arc. The infrared optical lens 110 may be configured to transmit infrared rays and block ultraviolet rays or visible rays.

Here, it is preferable that the infrared optical lens 110 is configured to selectively transmit an infrared band having a wavelength band of 800 nm to 860 nm. Since the infrared rays generated by the arc appear most strongly in the 800 nm to 860 nm wavelength band.

The fluorescent glass 120 may be configured to convert infrared rays output from the infrared optical lens 110 into visible light and output the visible light.

The visible light may be configured to be transmitted through optical fiber 130. The optical fiber 130 is configured to reduce disappearance of the visible light and to transmit the detected infrared signal, that is, the visible light, to the remote site as it is.

The optical fiber 130 is configured to be connected to a remote location one by one for each sensor composed of the infrared optical lens 110, the fluorescent glass 120, and the optical fiber 130, Fibers 130 as a bundle or a bundle.

Since it is possible to determine from which sensor the arc is detected according to whether the visible light is transmitted from the specific optical fiber 130, the position where the arc is generated can be accurately determined.

The infrared LED 140 may be configured to amplify and emit visible light output from the fluorescent glass 120. The user can grasp the light emission of the visible light ray by the infrared LED 140 and visually confirm the occurrence of the arc.

The light receiving lens 150 is installed at a remote place and can receive visible light transmitted through the optical fiber 130 and transmit the visible light.

The photodiode 160 may be configured to amplify and output the visible light transmitted through the light receiving lens 150.

The light receiving lens 150 and the photodiode 160 can constitute a light receiving device.

The arc occurrence determination module 170 may be configured to determine whether an arc is generated using the visible light output from the photodiode 160.

In addition, the arc occurrence determination module 170 may be configured to generate an alarm when the arc is determined to be generated, so that the user can recognize the arc immediately. In addition, the arc occurrence determination module 170 can be configured to accurately inform the user of an arc occurrence point.

3 is a block diagram of an arc generation determination module according to an embodiment of the present invention.

3, an arc generation determination module 170 according to an embodiment of the present invention includes an arc signal shaping circuit 171, an arc signal counter 172, a data latch 173 An alarm generation circuit 174, a pulse width conversion circuit 175, an arc start circuit 176, a digital signal processing circuit 177, and a display 178. [

Hereinafter, the detailed configuration will be described.

The arc signal shaping circuit 171 may be configured to convert a visible light transmitted through the optical fiber 130 into a logical signal. And may be configured to convert the pulse width of the logic signal to 'HIGH' or 'LOW' according to the size of the visible light and output the pulse width.

The arc signal counter 172 may be configured to count the number of arc occurrences using the logic signal converted by the arc signal shaping circuit 171. [ That is, the number of 'HIGH' signals having a pulse width of a predetermined pulse width or more may be counted to count the number of arc occurrences.

The data latch 173 can be configured to generate an alarm driving signal in accordance with the counted number of arcs generated in the arc signal counter 172. [ The data latch 173 may be configured to generate and output an alarm driving signal immediately when a predetermined number or more of arcs are generated within a predetermined time unit and the count number is stored.

The alarm generating circuit 174 may be configured to generate an alarm based on the alarm driving signal generated by the data latch 173. [ The alarm generating circuit 174 may be configured to output an alarm via an alarm speaker or may be configured to automatically transmit an alarm message to a user terminal (not shown).

The pulse width conversion circuit 175 may be configured to convert the pulse width to calculate the arc duration using the converted logic signal in the arc signal shaping circuit 171. [

The arc start circuit 176 may be configured to generate an arc start signal by the pulse width converted in the pulse width conversion circuit 175. [

The digital signal processing circuit 177 may be configured to perform frequency analysis and statistical analysis of the arc start signal generated by the arc start circuit 176 to determine whether the arc is continued. Frequency analysis and statistical analysis are used to judge the continuity or continuity of the arc.

The digital signal processing circuit 177 may be configured to stop the alarm of the alarm generating circuit 174 when it determines that the arc has been interrupted.

The display 178 may be configured to indicate whether the arc determined by the digital processing signal circuit 177 is continuing and where the arc is recognized through the optical fiber 130. [ It is possible that the signal from each sensor is predetermined for each optical fiber 130 and the position of each sensor is determined in advance.

4 is a graph illustrating an output error of the infrared-visible light conversion type according to an embodiment of the present invention.

Referring to FIG. 4, an output voltage for a light source in an infrared wavelength band is shown. Since the infrared light exists in addition to ultraviolet rays and visible rays as the noise light in the switchgear, it is necessary to accurately determine whether or not the arc is generated by recognizing the infrared noise that exists basically. Therefore, the infrared noise due to sunlight or the like corresponds to an output of 0.03 [V] when direct sunlight is incident as shown in Fig.

Therefore, the arc detection sensor 100 can be configured to determine the arc detection by setting the power density of the minimum detectable arc light to about 5 uW / cm2. Therefore, it is hardly affected by the sunlight noise.

5 is a structural view of an infrared optical lens according to an embodiment of the present invention.

Fig. 5 illustrates lay-out of an infrared optical lens.

Here, the infrared optical lens 110 preferably has a maximum incident angle of 55 degrees, an F number (F number) of 2.0, a refractive index of 1.713, and a dispersion of 53.94.

6 is a graph showing a refractive index / dispersion distribution diagram of an infrared optical lens according to an embodiment of the present invention.

6, the refractive index (nd) of the infrared optical lens 110 is preferably greater than 1.49 and less than 1.78, and the Abbe number (vd) is preferably greater than 46.0 and smaller than 91.0.

7 is a table showing the internal transmittance of a 5 mm thick infrared optical lens according to an embodiment of the present invention.

 7 is an internal transmittance which is obtained when the infrared optical lens 110 has a thickness of 5 mm and shows a transmittance of 50% or more for light of 800 nm to 860 nm.

 FIG. 8 is a graph showing MTF characteristics according to spatial frequencies of an infrared optical lens according to an embodiment of the present invention, and FIG. 9 is a graph showing spectral characteristics of an infrared ray transmitting filter according to an embodiment of the present invention.

Referring to FIGS. 8 and 9, the MTF characteristic according to the eye wave frequency of the infrared optical lens 110 is shown. In the case of the infrared optical lens 110, light in the infrared region between 800 nm and 860 nm is 85% to 90% But the light of the other wavelength band has a transmittance of about 0% and is substantially blocked.

10 is a graph showing a spectral distribution of an infrared optical lens according to an embodiment of the present invention.

As shown in FIG. 10, infrared rays of 800 nm to 860 nm wavelength band are detected by the infrared optical lens 110.

11 is a perspective view of an optical fiber according to an embodiment of the present invention.

In FIG. 11, the optical fiber 130 may be composed of an optical fiber bundle composed of a single optical fiber for each arc detection sensor 100, so that the position of the arc detection sensor 100 in which an arc is detected can be confirmed.

The optical fiber 130 may be configured to apply an infrared reactive phosphor to an end surface of the optical fiber 130.

12 is a transmission / reception sequence of a MODBUS-RTU protocol according to an embodiment of the present invention.

12, a light receiving device 150 including an infrared optical lens 110, a sensor including a fluorescent glass 120 and an infrared LED 140, a light receiving lens 150, a photodiode 160, Lt; / RTI >

In the present invention, the MODSU-RTU protocol is used and the communication bus is composed of RS485 MULTI-DROP and HALF DUPLEX.

The communication speed is preferably 19200 BPS and the data is preferably composed of 8 bits. The parity may be composed of NON, EVEN, and ODD.

In FIG. 12, T ₁ is the delay time between characters, T ₂ is the delay time between the request telegram and the response telegram, and T ₃ is the delay time between the start of the next frame after completion of the transmission and reception.

Baud rate T _{1 min} T _1max T 2 _min T _2max T 3 _min Variable availability Impossible Impossible possible Impossible possible 1200 bps
2400 bps
4800 bps
9600 bps
19200 bps
38400 bps 0 1.5 CT 10 CT
① T 2 _min
×
1.2 5 CT
②

In Table 1, CT denotes a 1-character transmission consumption time (1CT = 1 character number / Baud rate), T _2min is a time variable in the sensor, and T _3min is a time varying time in the master side Where 4 CT <5 ms, then T 2 _min ≥ 5 ms. If the operation of the previous frame is FNR 06h or 10h, an idle time of 100ms or more may be required.

The following shows the protocol format.

ADR FNR
(0x03) register
Start address register
Quantity CRC 1B 1B 2B 2B 2B

Table 2 shows the required telegrams, where the number of bytes is n × 2 BYTE (maximum byte quantity: 100).

ADR FNR
(0x03) byte
Quantity DATA1 ... ... DATEN CRC 1B 1B 1B 2B ... ... 2B 2B

Table 3 shows the response telegrams, where the number of bytes is n × 2 BYTE (maximum byte quantity: 100).

13 is a flowchart of a method of detecting an arc by a light conversion method according to an embodiment of the present invention.

Referring to FIG. 13, the infrared optical lens 110 selectively transmits and transmits infrared rays generated by an arc (S101).

Here, the infrared optical lens 110 may be configured to selectively treat infrared rays having a wavelength of 800 nm to 860 nm and an anti-reflection coating process that does not transmit light having other wavelengths.

The refractive index (nd) of the infrared optical lens 110 is greater than 1.49 and less than 1.78, and the Abbe number (vd) is greater than 46.0 and less than 91.0.

The infrared optical lens 110 may have a maximum incident angle of 55 degrees, an F number (F number) of 2.0, a refractive index of 1.713, and a dispersion of 53.94.

Next, the fluorescent glass 120 converts infrared rays output from the infrared optical lens 110 into visible light and transmits the visible light through the optical fiber 130 (S102).

Here, the optical fiber 130 may be composed of a bundle of optical fibers 130 composed of a single optical fiber 130 for each arc detection sensor, so that the position of the arc detection sensor in which an arc is detected can be confirmed.

The optical fiber 130 may be configured to apply an infrared ray-reactive phosphor to an end surface of the optical fiber 130.

Next, the infrared LED 140 amplifies visible light output from the infrared-ray-responsive phosphor and emits light (S103).

Next, the light receiving lens 150 receives and transmits the visible light transmitted through the optical fiber 130 (S104).

Next, a photodiode 160 amplifies and outputs the visible light transmitted through the light receiving lens 150 (S105).

Next, the arc occurrence determination module 170 determines whether an arc is generated by using the visible light output from the photodiode 160, and generates an alarm (S106).

The arc signal shaping circuit 171 converts a visible light transmitted through the optical fiber 130 into a logical signal and an arc signal counter 172 is connected to the arc signal shaping circuit 171 And a data latch 173 generates an alarm driving signal in accordance with the counted number of arcs generated by the arc signal counter 172.

Then, the alarm generating circuit 174 generates an alarm by the alarm driving signal generated by the data latch 173. [ Then, the pulse width conversion circuit 175 converts the pulse width to calculate the arc duration using the logic signal converted in the arc signal shaping circuit 171. [ The arc start circuit 176 generates an arc start signal by the pulse width converted by the pulse width conversion circuit 175.

The digital signal processing circuit 177 performs frequency analysis and statistical analysis of the arc start signal generated by the arc start circuit 176 to determine whether the arc is continued. When the arc is determined to have stopped, the alarm generating circuit 174 ) Is stopped. Display 178 indicates whether the arc determined by digital processing signal circuit 177 is continuing and where the arc is recognized through optical fiber 130. [

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. There will be.

110: Infrared optical lens
120: Fluorescent glass
130: Optical fiber
140: Infrared LED
150: receiving lens
160: Photodiode
170: arc occurrence determination module
171: Arc signal shaping circuit
172: arc signal counter
173: Data latch
174: Alarm generating circuit

Claims (17)

An infrared optical lens for selectively transmitting infrared rays generated by an arc in a switchboard and outputting the infrared light;
A fluorescent glass for converting infrared rays output from the infrared optical lens into visible light and outputting the visible light;
An optical fiber for transmitting visible light output from the fluorescent glass;
A light receiving lens for receiving and transmitting a visible light transmitted through the optical fiber;
A photodiode for amplifying and outputting visible light transmitted through the light receiving lens;
And an arc generation judging module for judging whether or not an arc is generated by using a visible ray outputted from the photodiode,
The arc generation judging module comprises:
An arc signal shaping circuit for converting a visible light transmitted through the optical fiber into a logical signal;
An arc signal counter for counting the number of arc occurrences using the logic signal converted by the arc signal shaping circuit;
A data latch for generating an alarm driving signal in accordance with the counted number of arcs generated in the arc signal counter;
An alarm generating circuit for generating an alarm by an alarm driving signal generated in the data latch;
A pulse width conversion circuit for converting a pulse width to calculate an arc duration time using the logic signal converted by the arc signal shaping circuit;
An arc start circuit for generating an arc start signal by the pulse width converted by the pulse width conversion circuit;
A digital signal processing circuit for determining whether the arc is continued by performing frequency analysis and statistical analysis of the arc start signal generated in the arc start circuit and stopping the alarm of the alarm generating circuit when it is determined that the arc is stopped; And
And a display for indicating whether the arc is determined by the digital signal processing circuit and an occurrence position of an arc recognized through the optical fiber. An arc detection system using an optical fiber for an infrared-visible light conversion system.
delete delete The optical pickup device according to claim 1,
Visible radiation conversion type arc detection system using an optical fiber, characterized in that an infrared ray having a wavelength of 800 nm to 860 nm is selectively transmitted and an anti-reflection coating process not transmitting light of other wavelengths is performed.
The optical pickup device according to claim 1,
Wherein the refractive index (nd) is greater than 1.49 and less than 1.78, and the Abbe number (vd) is greater than 46.0 and less than 91.0.
The optical pickup device according to claim 1,
Wherein the maximum incident angle is 55 degrees, the F number is 2.0, the refractive index is 1.713, and the dispersion is 53.94.
The optical fiber according to claim 1,
Wherein the arc detection sensor is composed of an optical fiber bundle composed of a single optical fiber for each of the plurality of arc detection sensors so that the position of the arc detection sensor in which the arc is detected can be confirmed.
The optical fiber according to claim 1,
And an infrared ray-reactive fluorescent material is applied to an end surface of the optical fiber.
The arc generation apparatus according to claim 1,
And an arc is generated when the power density of the arc exceeds 5 uW / cm &lt; 2 &gt;.
Selectively transmitting an infrared ray generated by an arc of an infrared optical lens and outputting the infrared ray;
Converting the infrared light output from the infrared optical lens into visible light by the fluorescent glass and transmitting the visible light through the optical fiber;
The infrared LED amplifies visible light emitted from the infrared-ray-responsive phosphor and emits the light;
Receiving and transmitting a visible light transmitted through the optical fiber by a light receiving lens;
Amplifying and outputting visible light transmitted through the light receiving lens by a photodiode;
And generating an alarm by judging whether or not an arc is generated by using an visible light beam output from the photodiode by the arc generation judging module.
The method of claim 10, wherein the step of determining whether an arc is generated using the visible light output from the photodiode,
The arc signal shaping circuit converting a visible light transmitted through the optical fiber into a logical signal;
Counting the number of arc occurrences using an arc signal counter using the logic signal converted in the arc signal shaping circuit;
Generating an alarm driving signal in accordance with a count of arcs generated by the data latch in the arc signal counter;
An alarm generating circuit generating an alarm by an alarm driving signal generated in the data latch;
The pulse width conversion circuit converting the pulse width to calculate the arc duration using the logic signal converted in the arc signal shaping circuit;
The arc start circuit generating an arc start signal by the pulse width converted in the pulse width conversion circuit;
The digital signal processing circuit performs frequency analysis and statistical analysis of the arc start signal generated in the arc start circuit to determine whether or not the arc continues, and stopping the alarm of the alarm generating circuit when it is determined that the arc is stopped;
Wherein the display is configured to indicate whether the arc determined by the digital signal processing circuit is continued or not and the generation position of an arc recognized through the optical fiber. Arc detection method.
11. The infrared optical lens according to claim 10,
Visible radiation conversion method using an optical fiber, characterized in that an infrared ray having a wavelength of 800 nm to 860 nm is selectively transmitted and an anti-reflection coating process not transmitting light of other wavelengths is performed.
11. The infrared optical lens according to claim 10,
Wherein the refractive index nd is greater than 1.49 and less than 1.78, and the Abbe number vd is greater than 46.0 and less than 91.0.
11. The infrared optical lens according to claim 10,
Wherein the maximum incident angle is 55 degrees, the F number is 2.0, the refractive index is 1.713, and the dispersion is 53.94.
The optical fiber according to claim 10,
Wherein the arc detection sensor is composed of an optical fiber bundle composed of a single optical fiber for each of the arc detection sensors so that the position of the arc detection sensor in which an arc is detected can be confirmed.
The optical fiber according to claim 10,
And an infrared ray-reactive fluorescent material is applied to an end surface of the optical fiber. The method of detecting an arc of an infrared-visible light conversion type using an optical fiber.
The method of claim 10, wherein the arc generation determination module determines whether an arc is generated using the visible light output from the photodiode, and generates an alarm,
And determining that an arc occurs when the power density of the arc exceeds 5 uW / cm &lt; 2 &gt;. 6. The method of detecting an arc of an infrared-visible light conversion type using an optical fiber.

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